Additive effects of threat-of-shock and picture valence on startle reflex modulation.
Additive effects of threat-of-shock and picture valence on startle reflex modulation.
复制标题
震动威胁和图像价对惊吓反射调制的添加作用。
DOI：
10.1371/journal.pone.0054003
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Vila J
中科院分区：
文献类型：
--
作者：
Bublatzky F;Guerra PM;Pastor MC;Schupp HT;Vila J
本研究探讨持续性预期焦虑对眨眼惊吓反射的情感调节的影响。为了达到这个目的，愉快的，中性的和不愉快的图片作为一个连续的流在交替的休克威胁和安全期，这是由彩色相框提示。记录眼轮匝肌-肌电图听觉惊吓探头和皮肤电活动。先前关于情感图片效价和休克威胁调制的研究结果被复制。主要的兴趣，预期厌恶事件和观看情感图片添加调制防御激活。具体而言，尽管整体增强惊吓眨眼幅度在休克的威胁条件下，惊吓反射仍然敏感的享乐图片价。最后，皮肤电导水平显示持续的交感神经激活在整个实验过程中的威胁-相比，安全期。总体而言，物理威胁的防御激活似乎独立于图片媒体的反射调制。目前的数据证实了在研究正常和异常焦虑时同时操纵阶段性恐惧和持续性焦虑的重要性。
The present study examined the effects of sustained anticipatory anxiety on the affective modulation of the eyeblink startle reflex. Towards this end, pleasant, neutral and unpleasant pictures were presented as a continuous stream during alternating threat-of-shock and safety periods, which were cued by colored picture frames. Orbicularis-EMG to auditory startle probes and electrodermal activity were recorded. Previous findings regarding affective picture valence and threat-of-shock modulation were replicated. Of main interest, anticipating aversive events and viewing affective pictures additively modulated defensive activation. Specifically, despite overall potentiated startle blink magnitude in threat-of-shock conditions, the startle reflex remained sensitive to hedonic picture valence. Finally, skin conductance level revealed sustained sympathetic activation throughout the entire experiment during threat- compared to safety-periods. Overall, defensive activation by physical threat appears to operate independently from reflex modulation by picture media. The present data confirms the importance of simultaneously manipulating phasic-fear and sustained-anxiety in studying both normal and abnormal anxiety.
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